In Nielsen's 56 metered markets, household results were: "The Tonight Show with Jay Leno," 2.5/6; CBS's "Late Show with David Letterman," 2.5/6; and ABC's combo of "Nightline," 3.2/8; and "Jimmy Kimmel Live," 1.5/5.

In the 25 markets with Local People Meters, adult 18-49 results were: "The Tonight Show with Jay Leno," 0.7/3; "Late Show," 0.5/3; "Nightline," 1.0/4; and "Jimmy Kimmel Live," 0.5/3.

At 12:35 a.m., "Late Night with Jimmy Fallon" (1.3/4 in metered-market households) tied CBS's "Late Late Show with Craig Ferguson" (1.3/4). In the 25 markets with Local People Meters, "Late Night" (0.5/3 in 18-49) topped "Late Late Show" (0.3/2).

At 1:35 a.m., "Last Call with Carson Daly" averaged a 0.9/4 in metered-market households and a 0.4/3 in adults 18-49 in the 25 markets with local people meters.

Here are the highlights of the 17 ad-sustained programs that aired in primetime on the broadcast networks one year ago (5/5/11):

And finally, a new "The Vampire Diaries" (2.67 million viewers, #16; adults 18-49: 1.2, #15) led into a new "Nikita" (1.93 million viewers, #17; adults 18-49: 0.8, #17) on The CW (2.30 million viewers, #5; adults 18-49: 1.0, #5).

In Nielsen's 56 metered markets, household results were: "The Tonight Show with Jay Leno," 2.8/7; CBS's "Late Show with David Letterman," 3.1/8; and ABC's combo of "Nightline," 3.5/8; and "Jimmy Kimmel Live," 1.6/5.

In the 25 markets with Local People Meters, adult 18-49 results were: "The Tonight Show with Jay Leno," 0.9/4; "Late Show," 0.8/4; "Nightline," 1.1/5; and "Jimmy Kimmel Live," 0.6/3.

At 12:35 a.m., "Late Night with Jimmy Fallon" (1.5/5 in metered-market households) tied CBS's "Late Late Show with Craig Ferguson" (1.5/5). In the 25 markets with Local People Meters, "Late Night" (0.8/5 in 18-49) topped "Late Late Show" (0.5/3).

At 1:35 a.m., Last Call with Carson Daly" averaged a 0.9/4 in metered-market households and a 0.4/3 in adults 18-49 in the 25 markets with local people meters.